CVE-2021-39223

Name: CVE-2021-39223
Creator: NVD / NIST
Published: 2021-10-25T22:15:07.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2021-39223 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.02%

59.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Nextcloud	Richdocuments	< 3.8.6
Nextcloud	Richdocuments	>= 4.0.0, < 4.2.3

References

https://github.com/nextcloud/richdocuments/pull/1760Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93Third Party Advisory
https://hackerone.com/reports/1253460Permissions Required, Third Party Advisory
https://github.com/nextcloud/richdocuments/pull/1760Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93Third Party Advisory
https://hackerone.com/reports/1253460Permissions Required, Third Party Advisory

Timeline

Published: Oct 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39223?

How severe is CVE-2021-39223?

CVE-2021-39223 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39223?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39223?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST